## Stability and instability results for the 2D a-Euler equations

##### Abstract

We study stability and instability of time independent solutions of the two dimensional a-Euler equations and Euler equations; the a-Euler equations are obtained by replacing the nonlinear term (u · ?)u in the classical Euler equations of inviscid incompressible fluid by the term (v · ?)u, where v is the regularized velocity satisfying (1 - a 2?)v equals u, and a greater than 0. In the first part of the thesis, for the a-model, we develop analogues of the classical Arnol’d type stability criteria based on the energy-Casimir method for several settings including multi connected domains, periodic channels, and others. In the second part of the thesis, we study stability of a particular steady state, the unidirectional solution of the a-Euler equation on the two dimensional torus, having only one non zero mode in its Fourier decomposition. Using continued fractions, we give a proof of instability of the steady state under fairly general conditions. In the third part of the thesis we study various properties of a family of elliptic operators introduced by Zhiwu Lin in his work on instability of steady state solutions of the two dimensional Euler equations. This involves Birman-Schwinger type operators associated with the linearization of the Euler equations about the steady state and certain perturbation determinants.

##### Degree

Ph. D.